Essential for the device to communicate with the PC in low-level mode.
The is powered by the robust HiSilicon Kirin 810 chipset . When a software crash, firmware corruption, or failed flash alters or erases its original identification parameters (resulting in a "Null" or "00000000" IMEI), professional flashing hardware is required. The industry standard for handling this Kirin-based device is SigmaKey (Sigma Plus) .
Use a heat gun or heating pad to soften the adhesive holding the back cover.
There is for JNY-LX1 (Kirin 810) to change IMEI. Tools like "Maui Meta" or "Write CDMA" do not support this chipset. Avoid fake YouTube tutorials that ask for TeamViewer – they will steal your data.
: A reliable USB Type-C data cable connected directly to the PC’s back panel (avoid USB hubs).
Locate the specific Kirin 810 testpoint pin for the JNY-LX1 (refer to the official SigmaPlus testpoint library for the exact pin layout).
Using a metal tweezer, short the testpoint pin to the metal shielding (ground) and connect the USB cable to the PC.
Because the JNY-LX1 requires a hardware testpoint connection to bypass bootloader security, you must carefully remove the back cover of the Huawei Nova 7i to expose the motherboard. Disconnect the battery before touching any internal components. Step 2: Locate the Testpoint
Navigate to the top-left dropdown menu and select the platform tab.
Repairing the IMEI on a Huawei JNY-LX1 (the Nova 7i) using Sigma Plus is a bit like digital surgery—it requires bypassing high-security locks that Huawei implemented to prevent exactly this kind of modification.
Now, proceed with the repair:
| Error | Solution | |-------|-----------| | "Handshake fail" | Wrong COM port mode. Ensure it's "Huawei COM 1.0", not fastboot. Re-do testpoint. | | "Credits required" | Your Sigma license needs Huawei credits. Purchase inside Sigma. | | "Device locked" | You forgot to remove Huawei/Google accounts. Factory reset and remove accounts. | | "IMEI invalid" | Checksum error. Re-type the 15 digits carefully. Last digit is a checksum – Sigma auto-corrects. | | "No service after repair" | You may also need to repair the or flash stock firmware via dload method. |
Here is an interesting breakdown of why this specific model is a challenge and how the "repair" actually works: The "Hardware Testpoint" Hack is powered by the